// includes方法用于判断数组中是否存在某一个值，存在返回true，否则返回false

let arr = ["a", "b", "c", "d"];

let result1 = arr.includes('a'); // true 包含
let result2 = arr.includes('e'); // false 不包含

console.log("includes方法返回1", result1);
console.log("includes方法返回2", result2);

